Corrects mojom::RouteProvider registration in ChildThreadImpl

ipc/ipc_channel_proxy.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef IPC_IPC_CHANNEL_PROXY_H_
 #define IPC_IPC_CHANNEL_PROXY_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 146 matching lines @@
   // guaranteed to not miss any messages.  But if you call this anytime after,
   // then some messages might be missed since the filter is added internally on
   // the IO thread.
   void AddFilter(MessageFilter* filter);
   void RemoveFilter(MessageFilter* filter);
 
   using GenericAssociatedInterfaceFactory =
       base::Callback<void(mojo::ScopedInterfaceEndpointHandle)>;
 
   // Adds a generic associated interface factory to bind incoming interface
-  // requests directly on the IO thread. MUST be called before Init().
+  // requests directly on the IO thread. MUST be called either before Init() or
+  // before the remote end of the Channel is able to send messages (e.g. before
+  // its process is launched.)
   void AddGenericAssociatedInterfaceForIOThread(
       const std::string& name,
       const GenericAssociatedInterfaceFactory& factory);
 
   // Adds a generic associated interface factory to bind incoming interface
-  // requests on the ChannelProxy's thread. MUST be called before Init().
+  // requests on the ChannelProxy's thread. MUST be called before Init() or
+  // before the remote end of the Channel is able to send messages (e.g. before
+  // its process is launched.)
   void AddGenericAssociatedInterface(
       const std::string& name,
       const GenericAssociatedInterfaceFactory& factory);
 
   template <typename Interface>
   using AssociatedInterfaceFactory =
       base::Callback<void(mojo::AssociatedInterfaceRequest<Interface>)>;
 
   // Helper to bind an IO-thread associated interface factory, inferring the
   // interface name from the callback argument's type. MUST be called before
@@ skipping 246 matching lines @@
   bool did_init_;
 
 #if defined(ENABLE_IPC_FUZZER)
   OutgoingMessageFilter* outgoing_message_filter_;
 #endif
 };
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_CHANNEL_PROXY_H_